import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:mobile_scanner/mobile_scanner.dart';

import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_bloc.dart';
import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_state.dart';
import 'package:hl_lieferservice/feature/scan/presentation/scan_screen.dart';
import 'package:hl_lieferservice/model/tour.dart';
import 'package:hl_lieferservice/widget/home/bloc/navigation_bloc.dart';
import 'package:hl_lieferservice/widget/home/bloc/navigation_event.dart';

enum TourHomeSteps { planning, delivery, off }

class ScanPage extends StatefulWidget {
  const ScanPage({super.key});

  @override
  State<StatefulWidget> createState() => _ScanPageState();
}

class _ScanPageState extends State<ScanPage> {
  int _currentStepIndex = 0;

  @override
  void initState() {
    super.initState();

    _tryFinish(context
        .read<TourBloc>()
        .state);
  }

  void _onStartScan() {
    Navigator.of(
      context,
    ).push(MaterialPageRoute(builder: (context) => ArticleScanningScreen()));
  }

  Widget _tourSteps(Tour tour) {
    var allArticlesScanned = tour.deliveries.every(
          (delivery) => delivery.allArticlesScanned(),
    );

    return Stepper(
      currentStep: _currentStepIndex,
      controlsBuilder: (context, details) {
        if (details.stepIndex == TourHomeSteps.planning.index) {
          return Container(
            alignment: Alignment.center,
            child: Padding(
              padding: const EdgeInsets.only(top: 15),
              child: FilledButton.icon(
                label: const Text("Scannen"),
                onPressed: _onStartScan,
                icon: const Icon(Icons.qr_code),
              ),
            ),
          );
        } else {
          return Container(
            alignment: Alignment.center,
            child: Padding(
              padding: const EdgeInsets.only(top: 15),
              child: FilledButton.icon(
                label: const Text("Auslieferung starten"),
                onPressed:
                allArticlesScanned
                    ? () =>
                    context.read<NavigationBloc>().add(
                        NavigateToIndex(index: 1))
                : null,
                icon: const Icon(Icons.local_shipping),
              ),
            ),
          );
        }
      },
      onStepContinue:
      _currentStepIndex >= 1
          ? null
          : () =>
          setState(() {
            if (_currentStepIndex < 2) {
              _currentStepIndex += 1;
            }
          }),
      onStepCancel:
      _currentStepIndex == 0
          ? null
          : () =>
          setState(() {
            if (_currentStepIndex > 0) {
              _currentStepIndex -= 1;
            }
          }),
      onStepTapped:
          (value) =>
          setState(() {
            if (_currentStepIndex == 1 && allArticlesScanned) {
              return;
            }

            _currentStepIndex = value;
          }),
      steps: [
        Step(
          title: Row(
            children: [
              Text(
                "Fahrzeuge beladen",
                style: TextStyle(
                  color: allArticlesScanned ? Colors.grey : null,
                ),
              ),
              Padding(
                padding: const EdgeInsets.only(left: 5),
                child:
                !allArticlesScanned
                    ? const Icon(
                  Icons.access_time_filled,
                  color: Colors.orangeAccent,
                )
                    : const Icon(
                  Icons.check_circle,
                  color: Colors.lightGreen,
                ),
              ),
            ],
          ),
          content: const Column(
            children: [
              Padding(
                padding: EdgeInsets.only(bottom: 10),
                child: Icon(Icons.barcode_reader, color: Colors.black),
              ),
              Text(
                "Scannen Sie die Ware, die Sie für die Auslieferungen benötigen.",
              ),
            ],
          ),
        ),
        Step(
          title: const Text("Ausliefern"),
          content: Container(
            alignment: Alignment.centerLeft,
            child:
            !allArticlesScanned
                ? const Text(
              "Scannen Sie erst die benötigte Ware, um die Auslieferungen zu beginnen.",
            )
                : null,
          ),
        ),
      ],
    );
  }

  Widget _info(Tour tour) {
    int amountArticles = tour.deliveries.fold(
      0,
          (acc, delivery) =>
      acc +
          delivery.articles
              .where((article) => article.scannable)
              .fold(
            0,
                (amountArticles, article) => amountArticles + article.amount,
          ),
    );

    int amountCars = tour.driver.cars.length;
    int amountDeliveries = tour.deliveries.length;

    return Padding(
      padding: const EdgeInsets.all(10),
      child: SizedBox(
        width: double.infinity,
        child: Card(
          color: Theme
              .of(context)
              .colorScheme
              .onSecondary,
          child: Padding(
            padding: const EdgeInsets.all(20),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                Padding(
                  padding: const EdgeInsets.only(top: 0),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Row(
                        children: [
                          Icon(Icons.archive),
                          Padding(
                            padding: const EdgeInsets.only(left: 5),
                            child: Text("Anzahl Artikel"),
                          ),
                        ],
                      ),
                      Text(amountArticles.toString()),
                    ],
                  ),
                ),

                Padding(
                  padding: const EdgeInsets.only(top: 15),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Row(
                        children: [
                          Icon(Icons.local_shipping_outlined),
                          Padding(
                            padding: const EdgeInsets.only(left: 5),
                            child: Text("Anzahl Fahrzeuge"),
                          ),
                        ],
                      ),
                      Text(amountCars.toString()),
                    ],
                  ),
                ),

                Padding(
                  padding: const EdgeInsets.only(top: 15),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Row(
                        children: [
                          Icon(Icons.person),
                          Padding(
                            padding: const EdgeInsets.only(left: 5),
                            child: Text("Anzahl Lieferungen"),
                          ),
                        ],
                      ),
                      Text(amountDeliveries.toString()),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  void _tryFinish(TourState state) {
    if (state is TourLoaded) {
      if (state.tour.deliveries.every(
            (delivery) => delivery.allArticlesScanned(),
      )) {
        setState(() {
          _currentStepIndex = 1;
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return BlocConsumer<TourBloc, TourState>(
      listener: (context, state) {
        _tryFinish(state);
      },
      builder: (context, state) {
        if (state is TourLoaded) {
          return Column(children: [_info(state.tour), _tourSteps(state.tour)]);
        }

        return Center(child: CircularProgressIndicator());
      },
    );
  }
}